Syringe



C. E. PIECK Nov. 2, 1937.

SYRINGE Filed July 16, 1935 INVENT OR v9/e1, E. P/ECK SSH, Ivm

Patented Nov. 2, 1931 UNITED STATES PATENT OFFICE Application July 16,

10 Claims.

This invention relates to a syringe which ls especially adapted to treatment of local irritations about the cervix uteri.

Among the objects of vthe invention is to pro- Vide such a syringe vadapted to measure and to deliver fluids, especially jellies, with positive action, considerable Velocity and a high degree of spattering action.

Another object is to provide such a syringe which is practically' unbreakable, easily demountable and which can be carried when demounted in a very small space.

Another object is to make the syringe oilproof and of widely variable capacity and adapted to expel practically all of its charge.

Referring to the accompanying drawing, Figure l is a longitudinal section thru the middle of the barrel, the piston parts being shown unsectioned.

Figure 2 is a similar view of the barrel portion only, showing a jointed construction of the barrel.

Figure 3 is an exterior View of the barrel only showing the jointed construction.

Figure 4 is a Side View of the compound piston; the inner stem being shown unscrewed from the sleeve.

Figure 5'is a cross section of the barrel socket.

Figure 6 is a plan viewof the barrel socket, viewed from its lower or threaded end.

In the drawing, I is a tubular barrel which is preferably made of the cellulose acetate transparent plastic called Tenite It may also be made of transparent synthetic resins of other types, or of glass. The barrel IIJ may be thread- 5 edly jointed intermediate of its ends, said joint being I I in Figures 2 and 3. The lower or insertible end I2 has a blunt taper as to both its inner and outer walls. As shown in Figure 3, the sleeve or larger portion of the barrel may bear a scale o indicating the amount of fluid that can be charged at diierent settings of the threaded joint I I, which is s'uiciently long to give a considerable range of adjustment.

Within the barrel I is a compound piston I3 which is shown separately in Figure 4. It is made in two parts, the lower one comprising a coneended plunger I4 and a threaded stem I5. The upper part comprises a'. cylindrical plunger IB and a sleeve II attached thereto. 'I'he sleeve is interiorly threaded to receive the stem I and is provided with a long narrow aperture I8, the edges oi' which are graduated. It is therefore evident that the piston may be shortened or lengthened by screwing the stem I5 into or out of the sleeve I l. By observing the stem thru the aperture, the

1935, Serial-N0. 31,645

charge can be regulated according to the scale on the aperture edges, the further the stem is screwed in the larger the charge.

.The plungers I4 and I6 are intended to t with some looseness, but not a great deal, inside the barrel I0. They should be freely movable by ordinary bulb air pressure even when the syringe is dry. The materials preferred forthese members are either of the artificial oil-proof soft rubbers known as Thiokol or DuPrene, the Iirst being an olene p olysuli'lde reaction product of empirical formula CuHznSx and the latter a tough elastic polymer of a plastic polymer of 2-ch1oro-buta 1:3 diene.

lThe tapered end of plunger I4 conforms to the inner wall of the lower end I2 of barrel II). The plunger end is grooved witha plurality of grooves I9 which if prolonged would meet at the apex of the cone. The purpose of the grooves is to prevent the adhering of the plunger I4 to the inner walls of end I2 when a jelly is used; in other words the grooves are an air admitting means adapted to break the vacuum after discharge.

When a. jointed barrel is used, the two plungers I4 and I6 may be of different sizes to fit the different internal diameters of the tubing used to form the barrel.

'I'he upper end of barrel I il is threaded to be received in the barrel socket 20. The latter is made preferably of synthetic resin. The threaded portion 2I ends at a substantial shoulder 22 against which the barrel I0 abuts. Communicating with portion 2| is a round opening 23 of substantial diameter, the wall 24 of which projects a suflicient distance beyond the bodyv of the barrel socket to provide a means for securely attaching a rubber or DuPrcne bulb 25. To this end the outer wall 24 is corrugated.

No provision is made in the bulb for admitting air, but two small holes 26 are molded or drilled thru the sides of the socket above the shoulder 2 I. They communicate with the opening 23 which in turn communicates with the interior of bulb 25. The thumb of the operator may be placed over one of these openings when the syringe is in use so that the amount of air leakage can be reduced if desired. The outside contour of that portion of the socket thru which th-e holes are drilled is that of a hexagonal iiange, as shown in Figure 6, so that rolling of the syringe is prevented.

It is evident that the shorter the compound piston I3 is made by screwing the stem I5 into the sleeve Il', the larger the charge sucked into and ejected from the syringe. In the one tube type of barrel as shown in Figure 1, the limit .tapered wall I2 of the barrel.

the two piece barrel, the limit may be as above,

occurs when the lower plunger I4 strikes the inner In the case of the stem I5 is sufciently unscrewed from sleeve I'I or it may be the striking of the lower edge of plunger I6 against the upper end 21 of the inner barrel. Since plunger I4 cannot contact the wall I2 if the stem I5 is adjusted too short, it follows that the liquid, if it is entirely ejected under such circumstances, must have been ejected by reason of its velocity acquired from the motion of the piston before the edge of plunger I6 contacted shoulder 21. While some liquids are too viscous to be entirely ejected by means of a push so acquired, nevertheless the viscosity of others is low enough so that they can be entirely ejected merely on account of their acquired velocity. pacity of a two piece barrel syringe with compound piston can be larger than that of a one piece barrel syringe for such liquids if the two piece barrel is extended to maximum length and the piston shortened as much as possible. It may be made so short that the plunger I4 lies within the larger diameter barrel section at the beginning of the stroke, but it will find its way into the smaller section because the front plunger being tapered can center itself. Cooperation therefore exists between the threaded adjusting means of the barrel and the threaded adjusting means of the compound piston, and the holes 26 also cooperate in the unique arrangement because one of them can be closed to assist the action just described.

It is pointed out that in my construction there is no hole thru the soft bulb. The holes cannot therefore, grow larger from use or be the starting point of a tear.

In operation the tip or lower end of the syringe is inserted into the liquid to be charged, the bulb being deflated. The bulb is then allowed to inflate itself, thereby sucking liquid into the barrel and retracting the piston. A quick squeeze is then given to the bulb and the piston ies forward until either the tip of the first plunger contacts the inner walls of the barrel tip, or in the case of a two piece barrel either the lower tip or the rear plunger shoulder comes in forcible contact with the barrel. Either action results in swift ejection of the charge and the spattering action is very pronounced.

I claim as my invention:-

1. In a syringe, a cylindrical barrel, a tapered constriction at the lower end thereof, a rigid socket at the upper end thereof, air inlet means in said socket, a soft pneumatic bulb attached to said socket and in pneumatic communication with the interior of said barrel, a compound piston Wholly within said barrel and screw means for adjusting the length of said piston, all of the parts of said piston being arranged to travel in unison during use.

2. In a syringe, a barrel, a compound piston in said barrel, plungers on said piston said plungers being made of soft rubberlike oil-proof substance, screw means for adjusting the length Consequently the ca-v of said piston and a scale on said piston for estimating the amount of charge for a given length, stop means on the lower end of said barrel to restrain said piston and pneumatic means on the upper end of said barrel for actuating said piston.

3. In a syringe, a barrel, a compound piston in said barrel, plungers on said piston at both ends thereof, an internally threaded sleeve attached to one plunger, said sleeve having a. long narrow aperture therein and a graduated scale on the edges of said aperture, an externally threaded stem attached to the other plunger, said stem being adapted to be screwed into said sleeve, and stop means for said piston at one end of said barrel.

4. In a syringe according to claim 3, plungers on said compound piston made of soft oil-proof rubber substitute.

5. In a syringe according to claim 3, plungers on said compound piston made of DuPrene, a tough elastic polymer of a plastic polymer of 2- chloro-buta 1:3 diene.

6. In a syringe according to claim 3, plungers on said compound piston made of Thiokol, an oleiine polysulde reaction product of empirical formula CuHznSx.

7. In a syringe, a barrel made of transparent molded plastic composition, a tapered lower end on said barrel, screw threads on the upper end of said barrel, a barrel socket threadedly attached thereto, a plurality of airholes transverse of said socket, means for attaching a bulb to said socket so that the latter is in pneumatic communication with said barrel, a bulb imperforate except for one opening, attached to said means and a compound adjustable piston in said barrel.

8. In a syringe, a two piece barrel, screw means for attaching the portions of said barrel together, one within the other, a compound piston within said barrel, plungers of diierent diameters on the ends of said piston, screw means for adjusting the length of said piston, means including a scale for judging the size of charge, carried on said piston adjusting means, a barrel socket attached to one end of said barrel, a tapered constriction on the other end of said barrel, a plurality of air holes thru the sides of said barrel socket, means for operatively attaching a bulb to said socket and a bulb so attached, said bulb being imperforate except as to the opening by which it is attached.

9. In combination with a syringe, a compound piston, the forward end of said piston being tapered, and a plurality of shallow grooves extending back from the point of said piston over the tapered portion.

l0. In combination, in a syringe, a barrel, a tapered forward e'nd thereon, a compound piston in said barrel, a tapered forward end on said piston, the taper thereof and the taper of the barrel-end interior being substantially the same; and a plurality of shallow grooves on said tapered piston end substantially parallel to the longitudinal axis of said piston.

CARL EDWARD PIECK. 

